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Hamamatsu.js #3 Promise入門
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jacoyutorius
May 18, 2018
Technology
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340
Hamamatsu.js #3 Promise入門
Hamamatsu.js #3にて発表したPromiseに関する資料です。
https://connpass.com/event/85858/presentation/
jacoyutorius
May 18, 2018
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Transcript
modern async in JavaScript 2018.5.19 yuto ogi Hamamatsu.js #3
i am… yuto ogi / @jacoyutorius Ruby / Rails JavaScript
/ Vue.js / Nuxt.js AWS
contents •modern async in Javascript •promise (ES6) •async/await (ES7)
purpose •promiseΦϒδΣΫτͷ͍ํΛཧղ͢Δ •callbackʹΑΔඇಉظॲཧͱͷൺֱ •promiseΦϒδΣΫτͷ࡞Γํ •Promise.all •Promise.race
playground in browser •RunKit (https://runkit.com/home/) •CodePen (https://codepen.io/) •Paiza (https://paiza.io/ja)
Promise is what? •ඇಉظॲཧΛநԽͨ͠ΦϒδΣΫτ •ΠϯλʔϑΣʔε͕౷Ұ͞ΕΔ •promise().then().catch(); •ޭ࣌resolveɺࣦഊ࣌reject ΛͦΕͧΕݺͿ •PromiseΦϒδΣΫτͷ࡞ •var
promise = new Promise(function(resolve, reject){ });
callback is troublesome •ωετ͕ਂ͘ͳΓ͕ͪ •Τϥʔ࣌ͷॲཧͷॻ͖ํ͕౷Ұ ͞Εͳ͍
callback Result => “hi!ABC” https://runkit.com/jacoyutorius/callback-is-troublesome A, B, C ͷ֤ϝιουͷॲཧॱΛ୲อ͢ΔͨΊίʔϧ όοΫΛ͏͕ɺωετ͕ਂ·ͬͯ͠·͏ɻ
Ex.1
promise Result => “hi!pApBpC” https://runkit.com/jacoyutorius/callback-is-troublesome Promise.then() ͰϝιουνΣΠϯ͢Δ͜ͱͰɺඇ ಉظॲཧͷॲཧॱΛ୲อ͢Δ͜ͱ͕Ͱ͖Δɻ pA, pB,
pC ϝιουʹͯͦΕͧΕpromiseΦϒδΣ ΫτΛฦ͢ඞཁ͕͋Δɻ Ex.1
Ex.2 API call by callback https://runkit.com/jacoyutorius/promise-call-api-sample-2 (JUIVCͷ"1*ΑΓɺਓؾϨϙδτϦͷҰཡΛऔಘ ͷϦετͷ൪ͷϨίʔυ ࠷ਓؾͷ͋ΔϨϙδτϦ ͷzDPOUSJCVUPST@VSMzΑΓίϯτϦϏϡʔλͷҰཡΛऔಘ
ͷ݁ՌΑΓɺίϯτϦϏϡʔλͷαϜωΠϧΛJNHλάͰׅͬͨྻΛ࡞
Ex.2 API call by promise https://runkit.com/jacoyutorius/promise-call-api-sample-2
•new Promise(fn) ͷΓ͕promiseΦϒδΣΫτ •fnʹඇಉظॲཧΛॻ͘ •fnresolveͱrejectͷ2ͭͷҾΛͱΔ •fn(resolve, reject) •ॲཧ݁Ռ͕ਖ਼ৗͰ͋ΕresolveɺΤϥʔͰ͋ΕrejectΛݺͿ creating new
Promise
creating new Promise Result => {user: “yuto”} https://runkit.com/jacoyutorius/creating-new-promise new Promiseʹ͢callbackʹඇಉظॲཧΛ࣮͢Δɻ
ॲཧͷ࠷ظͰresolve͔rejectͷ͍ͣΕ͔ΛݺͿɻ promiseΦϒδΣΫτͷॲཧ݁Ռ.thenͰड͚औΔɻ
creating new Promise Result => “error!” https://runkit.com/jacoyutorius/creating-new-promise .then(onFulfilled, onRejected) onFulfilledresolve͕ݺΕͨࡍͷΓΛड͚औΔɻ
onRejectedreject͕ݺΕͨࡍͷ݁ՌΛड͚औΔɻ
creating new Promise Result => “error!” https://runkit.com/jacoyutorius/creating-new-promise .catch() reject͕ݺΕͨࡍͷ݁ՌΛड͚͚Δϝιουɻ Promise.catch(“ࣦഊ࣌ͷίʔϧόοΫ”)
= Promise.then(undefined, “ࣦഊ࣌ͷίʔϧόοΫ”)
method chain (promise chain) Result => 1 => 3 =>
5 https://runkit.com/jacoyutorius/promise-method-chain
error handling Result => 1 => “Error!” https://runkit.com/jacoyutorius/promise-method-chain
Promise.all •Promise.all() ʹPromiseΦϒδΣΫτͷྻΛ͢ •ͨ͠promiseΦϒδΣΫτ͕શͯྃ͢Δͱɺ.then() ʹPromiseΦϒδΣ ΫτͷฦΓ͕ྻͰฦͬͯ͘Δ
Promise.all Result => [1, 2] https://runkit.com/jacoyutorius/promise-all
Promise.race •Promise.race() ʹPromiseΦϒδΣΫτͷྻΛ͢ •ͨ͠promiseΦϒδΣΫτͷ͏͍ͪͣΕ͔͕ྃ͢Δͱɺ.then() ʹྃ ͨ͠PromiseΦϒδΣΫτͷฦΓ͕ฦͬͯ͘Δ •ଞͷpromiseΦϒδΣΫτΩϟϯηϧ͞ΕΔΘ͚Ͱͳ͘ɺ࣮ߦ͞ΕΔ • promiseʹΩϟϯηϧͱ͍͏֓೦ͳ͍ •λΠϜΞτॲཧΛ࣮͢Δࡍʹ͏ͱྑ͍Β͍͠
Promise.race Result => 2 https://runkit.com/jacoyutorius/promise-all
end •PromiseͰҰ൪େ͖͍ͷඇಉظॲཧͷॻ͖ํ͕౷Ұ͞ΕΔ͜ͱ •ͱ͍͑ɺۙͷjsϑϨʔϜϫʔΫnpmύοέʔδͰΓ͕PromiseΦϒδΣΫτ ͷͷ͕΄ͱΜͲͳͷͰԡ͓͖͍͑ͯͨ͞ •promiseͷଞʹ࠷ۙΑ͘ݟ͔͚Δ͜ΕΒˣͷػೳ •async/await •Arrow function •ԡ͓͖͍͑ͯͨ͞ɻશ͘ະͷػೳͱ͍͏Θ͚Ͱͳ͍ͷͰ࠷ॳྲྀ͢ఔͰ͍͍͔
docs. •JavaScript MDN (https://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/ Using_promises) •JavaScript Promiseͷຊ (http://azu.github.io/promises-book/)